I have a friend's rifle that I am doing some load development for. It is a 6.5-06, and has an 'older' Lilja barrel on it. I do not know the history of this barrel.
When I 1st got the rifle home, I cleaned it thoroughly, but could not seem to get the faint trace of copper to quit showing up on the patches. I am using Tetra cleaner w/ a nylon brush. I thought that perhaps I was getting a trace of purple on the patches from the brass that the nylon brush is make w/. I do not get this w/ my rifles, so I think that it is in the barrel.
Each time that I have shot the rifle and re-cleaned, it shows a fair amount of copper that drops down to a trace as I clean. No matter how long I clean, it will not quit tracing.
This rifle is throwing fliers like I have not experienced before. I am not sure if it is the fouled barrel or that my load development is just not good. I hate to keep chasing after a load if it is the barrel.
Steve, I had a badly fouled M77 barrel that I treated with Wipeout. It took about 8 long applications to get all the copper out, but it did work. I was haveing accuracy issues with this gun and took it to a smith to get bore scoped. The bore was pitted and the throat toasted, but all copper and powder fouling were gone. It was bright and shiney. Wipeout works.
Just been going through this my self. I have spent lots of $$ trying different things. Slip 2000 for the powder and BoreTech Elimintor for the copper. Best stuff I have found. I keep trying new things but end up going back to them.
And yes, The stubborn ones take a long time. I wet it , brush, wait 5 min, wet brush again then wet patch it out. If it shows blue after setting 4 or 5 min. I start the process again.
Shoot I'll take that deal! Works amazing for me, and if you got a real tough guy (aka Grandpa) have em take a whiff of this stuff, then when they wake up they will take your word for things. Just make sure they aren't holding the bottle when they go down. ;)